More than half a million people are expected to celebrate New Year's Eve in Melbourne with authorities putting parts of the city into "lockdown" as they try to guarantee the safety of revellers.
Extra bollards will be installed and hundreds of police will patrol the streets to protect inner city partygoers from potential attacks, acting Commissioner Andrew Crisp said on Friday.
"In relation to the CBD itself, we basically lock down the centre of the city," Mr Crisp said.
Key streets in the city and nearby Docklands precinct will also be closed to vehicles, he added.
"What that means for us in terms of numbers, in round figures, that's about 2,000 police over and above our business-as-usual committed to New Year's Eve," Mr Crisp said.
Of those, 1000 officers would be deployed in the city to protect partygoers, he said.
"It is about the friendly approach, we know you can come into the city, go to events across the state and you will be safe."
Victorian premier Daniel Andrews urged visitors and locals to come and celebrate the new year in the city but warned unacceptable behaviour would not be tolerated.
"People need to use their common sense and also look out for each other," Mr Andrews said.
"If you see something that doesn't quite add up, if you're suspicious about a person's conduct speak to one of those hundreds of extra uniformed police that will be out and about," he said.
The heightened security concerns come after a Werribee man was charged in November with allegedly plotting a New Year's Eve terror attack at locations including Federation Square.
The acting commissioner have said they have no information to suggest further planned attacks.
While bollards were in place to prevent vehicle access across Melbourne in 2016, recent car attacks at Bourke Street and Flinders Street have prompted additional measures.
"We had those bollards in place last year and again what happened last week it's just reinforced the need for us to strengthen the area where most people congregate," Mr Crisp said.
Sunday's partygoers are being urged to use public transport.
An extra 100 train services will run to get more than 100,000 people in and out of the city on the night, Public Transport Victoria spokesman Dean Tillotson said.
More than $2.6 million is being spent on the celebrations in Melbourne, including 14 tonnes of fireworks.
